hey!! i got this hard math q i found online! its reeli challenging--well 4 me >.<

on a Saturday morning Sue felt like getting some exercise. So she left home at 7 am and walked to a shop along a flat road. When she reached the shop, she immediatley started to walk to an oval along a raod which was never flat. After she came to the oval, she did not stop but turned around and walked along the same route back home. She got home at noon. What was the distance she covered during the morning, if her speeds on the flat road, uphill and down hill were 4km/h, 3km/h and 6km/h respectively?

could neone help me? it seems reeli difficult :D